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TROUBLESHOOTING AND REPAIR
LN-7 GMA WIRE FEEDER
F-20
WIRE FEED SPEED POTENTIOMETER REPLACEMENT
(continued)
6. Place the new potentiometer through
the case from the inside. Ensure that
the index pin on the potentiometer fits in
the locating hole on the case of the wire
feeder. Install the lockwasher and nut
on the potentiometer. Tighten until
snug.
7. Install the knob onto the potentiometer
and tighten the setscrew to lock the
knob in place.
8. Reinstall the cover onto the control box
using the four hex head bolts.
9. Measure the wire feed speed using a
K283 Hand Held Wire Feed Speed
Meter. To measure the wire feed speed
if a K283 is not available, feed the wire
for six seconds, measure the length of
wire fed, and multiply by ten. The
measured wire speed should
approximately equal that shown on the
potentiometer name plate. If the wire
feed speed is not correct then check the
motor brushes. Also, the motor or the
control board may be faulty.